1. Vincent flipped three coins during a probability experiment. The outcomes of the first 40 trials are shown in the table.
Probability Experiment
Faces Showing on
Flipped Coins
Number of
Outcomes
3 tails
4
1 head, 2 tails
13
2 heads, 1 tail
16
3 heads
7
Based on the information in the table, in how many of the next 120 trials will the outcome be
exactly two of the coins showing heads?

Arandomized controlled trial is designed to evaluate the effect of metoprolol in patients with heart failure. while preparing for statistical analysis, the researcher reviews some common types of statistical errors. which of the following statements is true regarding a type i error in a clinical study? a. the study is not significantly powered to detect a true difference between study groups. bthe null hypothesis is true but is rejected in error. c. the null hypothesis is false but is accepted in error. d. type i error is also known as beta and is usually 0.1 or 0.2. e. type i error depends on the study's confidence interval.